CEL P0401 - Insufficient EGR Flow
#1
CEL P0401 - Insufficient EGR Flow
Hi guys. My 1999 Honda Accord set the CEL P0401 code (insufficient EGR flow). I reset the CEL and it came back a few weeks later (I think it was a warmer day than the previous days). Anyways, I'm getting about 21 MPG city (I know clogged EGRs can reduce fuel efficiency), is that particularly low?
I've seen some tutorials/videos (none specific to my model). I haven't seen anything that was that good explaining the process. Also I've seen people clean out their whole throttle body / intake manifold which looks pretty complicated.
It doesn't look like I can reach 1 of the 2 bolts (the one closer to the manifold) without removing other parts out first. Should I just take it to the shop?
I've seen some tutorials/videos (none specific to my model). I haven't seen anything that was that good explaining the process. Also I've seen people clean out their whole throttle body / intake manifold which looks pretty complicated.
It doesn't look like I can reach 1 of the 2 bolts (the one closer to the manifold) without removing other parts out first. Should I just take it to the shop?
#2
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Re: CEL P0401 - Insufficient EGR Flow
http://www.hondaaccordforum.com/foru...-accord-31002/
and
https://honda-tech.com/forums/honda-accord-1990-2002-2/f23a4-ulev-2691467/
and
http://www.driveaccord.net/forums/sh...ad.php?t=31865
and
https://honda-tech.com/forums/honda-accord-1990-2002-2/
cleaning the throttle body valve is much easier than this in comparison
and
https://honda-tech.com/forums/honda-accord-1990-2002-2/f23a4-ulev-2691467/
and
http://www.driveaccord.net/forums/sh...ad.php?t=31865
and
https://honda-tech.com/forums/honda-accord-1990-2002-2/
cleaning the throttle body valve is much easier than this in comparison
#3
Re: CEL P0401 - Insufficient EGR Flow
Cleaning helps but in the end, I had to replace the EGR altogether to make my P0401 go away on my 99 accord :/ There's a cleaning procedure that requires taking off the entire intake manifold. Check that one out.
#4
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Re: CEL P0401 - Insufficient EGR Flow
already stated in one of the 4 links i posted
be sure to rule out the passageways and vacuum hoses first before replacing the valve
try blasting the valve itself with some carb cleaner as well
be sure to rule out the passageways and vacuum hoses first before replacing the valve
try blasting the valve itself with some carb cleaner as well
#5
Re: CEL P0401 - Insufficient EGR Flow
i had the same problem on my 96 i replaced the egr and that wasnt the problem so talked to a guy that helps work on my cars and we found out that the egr ports on the intake under the fuel rail were full of carbon
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cpgottabuh
Honda Accord (1990 - 2002)
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07-11-2008 11:35 AM